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Homework 11 - Practice Problems; Rotation. Fluids

# Homework 11 - Practice Problems; Rotation. Fluids -...

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sanchez (es25396) – Homework 11 - Practice Problems; Rotation. Fluids – guevara – (130101) 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – fnd all choices be±ore answering. 001 (part 1 o± 2) 10.0 points A uni±orm solid disk and a uni±orm hoop are placed side by side at the top o± an incline o± height h . I± they are released ±rom rest and roll with- out slipping, determine their speeds when they reach the bottom. ( d = disk, h = hoop) 1. v d = r 4 3 h g , v h = R h g 2. v d = R h g , v h = R 2 h g 3. v d = r 1 2 h g , v h = r 1 3 h g 4. v d = r 2 3 h g , v h = R 3 h g 5. v d = R 2 h g , v h = R h g 002 (part 2 o± 2) 10.0 points Which object reaches the bottom frst? 1. the disk 2. the hoop 3. both at the same time 003 10.0 points A fgure skater on ice spins on one ±oot. She pulls in her arms and her angular speed in- creases. Choose the best statement below. 1. Her angular speed increases because her potential energy increases as her arms come in. 2. Her angular speed increases because air ±riction is reduced as her arms come in. 3. Her angular speed is unrelated to her arms. She pulls them in at the same time as she speeds up her spin because it looks better this way. 4. Her angular speed increases because by pulling in her arms she creates a net torque in the direction o± rotation. 5.

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Homework 11 - Practice Problems; Rotation. Fluids -...

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